Isistimu ehambisanayo iwukuxazulula inkinga yokuthi iphakethe lebhethri eline-voltage ephezulu lishaja kuphakethe lebhethri lamandla aphansi ngenxa yomehluko kagesi phakathi kwamaphakethe ebhethri. Ngoba ukumelana kwangaphakathi kweseli yebhethri kuphansi kakhulu, ngakho-ke ukushaja kwamanje kuphezulu kakhulu, okuvame ukuba sengozini.Sithi i-1A, 5A, 15A ibhekisela kumanje okulinganiselwe ukushaja ibhethri.